CN114898570B - Expressway elastic passing method under severe weather - Google Patents

Abstract

The invention discloses an elastic passing method of a highway in severe weather, which comprises the following steps: s1, dividing a target road section into an unaffected region, an affected transition region and an affected region; s2, setting traffic identification information for the vehicle; the traffic identification information comprises an entry point and an exit point; s3, monitoring weather change conditions of a target road section, and adjusting the unaffected area, the affected transition area and the range of the affected area according to the weather change conditions; s4, adjusting the driving-in point and the driving-out point according to the adjustment result of the step S3, so that the driving-in point and the driving-out point are both located in the adjusted unaffected area or the adjusted affected transition area range, and the vehicle passes according to the adjusted driving-in point and the adjusted driving-out point; s5, repeating the steps S3-S4 until the vehicle leaves the target road section. The invention can meet the traffic demand of the expressway in severe weather to the maximum extent, ensures the traffic safety of vehicles and improves the traffic efficiency of vehicles.

Description

Flexible traffic method of expressway in bad weather

technical field

The invention relates to the field of road traffic, in particular to a method for elastic expressway traffic in bad weather.

Background technique

Severe weather can easily cause severe traffic accidents and large-scale traffic congestion on expressways, which reduces the overall resilience of expressways and seriously affects road traffic operations and economic and social development. Affected by severe weather such as snowfall, heavy rain, and heavy fog, it is a common practice in countries around the world to adopt control measures such as closing and restricting expressways.

In order to effectively prevent serious road traffic safety accidents in bad weather and ensure the safety of expressway drivers and passengers, industry authorities and expressway operation and management companies often adopt a "one size fits all" road closure control model. For example, when the expressway encounters heavy fog, most of them are closed, and the section without heavy fog is also closed or restricted, which seriously affects the demand for expressway traffic in the non-foggy section and restricts public traffic. travel.

Contents of the invention

In view of this, the purpose of the present invention is to overcome the defects in the prior art, provide a method for expressway flexible traffic in bad weather, can satisfy the traffic demand of the highway in bad weather to the greatest extent, ensure the safety of vehicles and improve the vehicle traffic efficiency.

The expressway flexible traffic method under bad weather of the present invention comprises the following steps:

S1. Divide the target section into an unaffected area, an affected transition area, and an affected area;

S2. Set the traffic identification information for the vehicle; the traffic identification information includes the entry point and the departure point; the entry point and the departure point are located in the unaffected area or the affected transition area;

S3. Monitor the weather changes of the target road section, and adjust the range of the unaffected area, affected transition area, and affected area according to the weather changed;

S4. According to the adjustment result of step S3, adjust the entry point and the departure point, so that both the entry point and the departure point are located in the adjusted unaffected area or the adjusted affected transition area, and the vehicle is adjusted according to the adjusted Entry point and exit point for traffic;

S5. Steps S3-S4 are repeated until the vehicle leaves the target road section.

Further, the step S4 also includes: performing release control on the vehicles, so that the release time interval between the released vehicles is h _t .

Further, the release time interval h _t is determined according to the following formula:

Among them, s _safe is the safe distance between vehicles in the impact transition area, and v _f is the average driving speed in the impact transition area.

Further, the step S4 also includes: performing release control on the vehicle, so that the release cycle of the vehicle is T.

Further, the release period T is determined according to the following formula:

Among them, k is the number of entry points in the unaffected area, Δx _i is the i-th distance in the unaffected area, v _c is the average driving speed on the road section in the unaffected area, and P ₀ is the set value.

Further, the step S4 further includes: limiting the number of vehicles released from the entry point, so that the number of vehicles is N.

Further, the number N _m of vehicles released from the entry point m is determined according to the following formula:

in, Represents rounding down, Δx _m,n is the distance between the entry point m and the entry point n, the entry point n is adjacent to the entry point m, and the entry point n is located at the entry point upstream of m.

The beneficial effect of the present invention is that: a method for flexible expressway traffic under severe weather disclosed by the present invention divides expressway sections according to the degree of influence of severe weather, so that vehicles are less affected by severe weather. For normal traffic in the area, on the basis of ensuring the safety of vehicles, it can meet the traffic demand of the expressway to the greatest extent; and according to the real-time detection of the scope of severe weather influence, dynamically adjust the range of the road section that can be passed, and at the same time, through the control of toll stations The number and clearance interval of the entrance vehicles are used to control the flow of traffic flow in the road sections that are less affected by bad weather, ensuring the safety of vehicles and improving the efficiency of vehicle traffic.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing and embodiment:

Fig. 1 is a schematic flow chart of the method of the present invention;

Fig. 2 is a schematic diagram of the divided regions of the target section of the present invention;

Fig. 3 is a schematic diagram of vehicle release control in the present invention.

Detailed ways

Below in conjunction with accompanying drawing, the present invention is further described, as shown in Figure 1:

The expressway flexible traffic method under bad weather of the present invention comprises the following steps:

S1. Divide the target section into an unaffected area, an affected transition area, and an affected area;

S2. Set the traffic identification information for the vehicle; the traffic identification information includes the entry point and the departure point; the entry point and the departure point are located in the unaffected area or the affected transition area;

S3. Monitor the weather changes of the target road section, and adjust the range of the unaffected area, affected transition area, and affected area according to the weather changed;

S4. According to the adjustment result of step S3, adjust the entry point and the departure point, so that both the entry point and the departure point are located in the adjusted unaffected area or the adjusted affected transition area, and the vehicle is adjusted according to the adjusted Entry point and exit point for traffic;

S5. Steps S3-S4 are repeated until the vehicle leaves the target road section.

In the present embodiment, the scene shown in Fig. 2 is taken as an example for illustration, and according to the degree of bad weather influence, the target road section is successively divided into an area not affected by bad weather and a weakly affected area by bad weather (that is, an area affected by transition). area) and areas affected by severe weather. Starting from the toll station 6 is the jurisdiction of a certain expressway management company, that is, the area of the target road section. Among them, the downstream of toll station 1 is the area affected by severe weather, the area between toll station 3 and 1 is less affected by severe weather, and the area between toll station 6 and 3 is not affected by severe weather. Wherein, the traveling direction of the vehicle is the direction from the toll station 6 to the toll station 5 .

In this embodiment, in step S2, the passing identification information is set for the passing vehicle. Specifically, taking a vehicle that intends to get on the expressway from the toll station 6 as an example, the driver fills in the identity information, license plate on the client side of the expressway management system. Information, leave the toll booth of the expressway, such as toll booth 1, and make a travel reservation. That is, the entry point of the vehicle is the toll booth 6 and the exit point is the toll booth 1 .

By filling in the above information, a green code will be obtained after review by the expressway management system; if the toll station filled in by the driver is the downstream toll station of toll station 1, the red code will be obtained, and the driver will not be able to pass this section of the expressway or will need to fill in the destination again land.

Further, the driver scans the green code at the toll booth 6 to enter the expressway, and the driver can leave the expressway at the toll booth 1 or its upstream toll booth to complete a pass based on the pass code. If the driver passes through the area affected by bad weather and departs from the downstream toll station of toll station 1, it is considered a violation and affects his credit (both the vehicle and the driver are affected). When the pass code is used several times next time, a yellow code will be automatically generated, and the system will review it. It will not pass, and it is impossible to pass this section of the expressway under bad weather conditions during the penalty period. Among them, the number of punishments is determined by the administrator.

In this embodiment, in steps S3 and S4, as the scope of bad weather expands or shrinks, the travel range will be flexibly adjusted through mobile phone client message push. Taking the above-mentioned vehicle as an example, if the area affected by bad weather expands to between tollbooth 2 and 1, the driver will be notified to leave from tollbooth 2 by SMS or voice. If the driver still drives away from the downstream toll station of toll station 1, it will be considered a violation and affect his credit. If the area affected by bad weather is reduced to the downstream toll station of toll station 1, the driver will be notified by SMS or voice to continue driving to the downstream toll station; if the affected area completely disappears, the driver will be notified to freely drive.

In this embodiment, in order to ensure the safety of vehicles and improve the efficiency of vehicles, it is necessary to control the release of vehicles, so that the release time interval between the release vehicles is h _t , and the release cycle of the release vehicles is T.

As shown in Figure 3, the toll station 3 is the boundary of the road section that is weakly affected by severe weather, and the toll station 6 is the farthest toll station from the area affected by severe weather. The oblique arrow indicates the space-time trajectory of the vehicle. Vehicles must maintain a safe distance s _safe to drive; wherein, the safe distance s _safe is determined according to the norms or the manager's experience.

Determine the release time interval h _t according to the following formula:

Among them, s _safe is the safe distance between vehicles in the area with weak influence of severe weather, and v _f is the average driving speed of vehicles in the area with weak influence of severe weather.

Starting from the initial entry point of the target road segment, set the release cycle T, and the release cycle at other entry points is the same as the initial entry point. Specifically, the toll station 6 is the initial entry point of the target road section, then for the toll station 6, the release period T is determined according to the following formula:

Among them, k is the number of entry points in the unaffected area, Δx _i is the i-th distance in the unaffected area, v _c is the average driving speed on the road section in the unaffected area, and P ₀ is the set value. Specifically, the value of k is 3, that is, there are three entry points including toll stations 6, 5 and 4 in the unaffected area; Δx _5,6 is the first distance in the unaffected area , Δx _4,5 is the second interval in the unaffected area, Δx _3,4 is the third interval in the unaffected area; the value of P ₀ is the number of vehicles N ₆ released by the toll station 6, the number of vehicles The value of N ₆ is determined by the administrator. If you want to reduce the backlog of vehicles at the toll station, you should make N ₆ smaller, otherwise make N ₆ larger.

In order to meet the traffic demand and further ensure the traffic safety of vehicles, the number of vehicles released from the entry point is limited, so that the number of vehicles is N. As shown in Figure 3, tollbooths 5, 4 and 3 can all be entry points, specifically, for the number of vehicles N ₅ released from tollbooth 5:

in, Indicates rounding down, Δx _5,6 is the distance between toll booth 5 and toll booth 6.

For the number N ₄ of vehicles cleared from the tollbooth 4:

in, Indicates that it is rounded down, and Δx _4,5 is the distance between toll booth 4 and toll booth 5.

For the number N ₃ of vehicles cleared from the tollbooth 3:

in, Indicates that it is rounded down, and Δx _3,4 is the distance between toll booth 3 and toll booth 4.

Finally, it is noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be carried out Modifications or equivalent replacements without departing from the spirit and scope of the technical solution of the present invention shall be covered by the claims of the present invention.

Claims (5)

1. A method for flexible passage of freeways under bad weather, characterized in that: comprise the steps: S1. Divide the target section into an unaffected area, an affected transition area, and an affected area; S2. Set the traffic identification information for the vehicle; the traffic identification information includes the entry point and the departure point; the entry point and the departure point are located in the unaffected area or the affected transition area; S3. Monitor the weather changes of the target road section, and adjust the range of the unaffected area, affected transition area, and affected area according to the weather changed; S4. According to the adjustment result of step S3, adjust the entry point and the departure point, so that both the entry point and the departure point are located in the adjusted unaffected area or the adjusted affected transition area, and the vehicle is adjusted according to the adjusted Pass through at the entry point and the exit point; control the release of the vehicle so that the release period of the vehicle is T; Determine the release period T according to the following formula: Among them, k is the number of entry points in the unaffected area, Δx _i is the i-th distance in the unaffected area, v _c is the average driving speed on the road section in the unaffected area, P ₀ is the set value, and release time interval h _t ; S5. Steps S3-S4 are repeated until the vehicle leaves the target road section. 2 . The method for flexible expressway traffic under severe weather according to claim 1 , characterized in that: said step S4 further comprises: controlling the release of vehicles so that the release time interval between the vehicles is h _t . 3. The expressway elastic passage method under bad weather according to claim 2, is characterized in that: determine the release time interval h _t according to the following formula: Among them, s _safe is the safe distance between vehicles in the impact transition area, and v _f is the average driving speed in the impact transition area. 4. The method for flexible freeway traffic under severe weather according to claim 1, characterized in that: said step S4, further comprising: limiting the number of vehicles released from the entry point, so that the number of vehicles is N. 5. The expressway elastic traffic method under bad weather according to claim 4, is characterized in that: determine the vehicle quantity N _m that is released from the entry point m according to the following formula: in, Represents rounding down, Δx _m,n is the distance between the entry point m and the entry point n, the entry point n is adjacent to the entry point m, and the entry point n is located at the entry point upstream of m.